Last updated: August 21, 2025
September in Pago Pago, American Samoa delivers a warm tropical experience, where temperatures typically hover around an average of 27°C (80°F), with daily highs peaking at 28°C (83°F) and lows dipping to 25°C (77°F). This month is characterized by high humidity levels, averaging at 84%, making it feel even warmer. However, visitors should be prepared for rainfall, as 136 mm (5.4 in) of precipitation falls over approximately 21 days, underscoring the lush, vibrant landscape that defines this stunning destination. Embrace the rich atmosphere and beauty of September, knowing that occasional showers only enhance the island's natural allure.
In September, the weather in Pago Pago, American Samoa, continues the trend of mild tropical temperatures, with minimums hovering around 25°C (77°F) and averages settling at a comfortable 27°C (80°F). The maximum temperatures peak at 28°C (83°F), showing a slight dip compared to the summer months, but still offering pleasant warmth that visitors and locals alike appreciate. With consistently warm conditions throughout the year, September is no exception, presenting the perfect backdrop for outdoor activities while maintaining a cozy atmosphere that invites relaxation. As the island transitions toward the end of the dry season, these stable temperatures reinforce Pago Pago’s reputation as a year-round paradise.
September in Pago Pago, American Samoa, marks a transition towards the wetter months, with precipitation reaching 136 mm (5.4 in) over 21 days. This slight increase in rainfall from August’s 128 mm (5.1 in) signifies a gradual buildup as the island moves into the more pronounced rainy season. While September sees fewer rainy days compared to the peak months ahead, the consistent precipitation hints at the lingering tropical climate. Overall, the data suggests a steady rhythm of rainfall throughout the year, with September serving as a bridge to the notably wetter October characterized by an uptick to 225 mm (8.9 in), reinforcing the seasonal patterns of this vibrant region.
In September, Pago Pago experiences a noticeable uptick in humidity, reaching 84%, the highest of the year. This gradual rise throughout the months reflects an upward trend, beginning at 79% in January and consistently climbing, peaking with a significant surge during late summer. As the island transitions into October, humidity further escalates to 85%, indicating a climatic consistency that defines the tropical paradise. Overall, the pattern of increasing humidity underscores the warm, lush environment typical of this beautiful region, inviting visitors to enjoy the vibrant landscapes and rich ecosystems that flourish under such conditions.
As September rolls into Pago Pago, American Samoa, the UV Index remains high at 14, classifying it within the extreme exposure category, with a burn time of only 10 minutes. This reflects a slight increase from August's UV Index of 12, underscoring the consistent intensity of the sun in this tropical locale. The trend throughout the year sees January through April maintaining an unwaveringly extreme index, while May marks the start of a gradual decrease, only to rise again in late summer and early autumn. For those enjoying the vibrant outdoors, it’s essential to stay vigilant about sun protection during this time. For detailed information, check out the Pago Pago UV Index.
UV Risk Categories
In September, Pago Pago basks in 301 hours of sunshine, reflecting a delightful trend as the island transitions towards the end of the year. This month boasts a significant increase in daylight compared to the earlier months, surpassing both January and February by a substantial margin. As summer tends to linger, the sunshine hours remain robust, right in line with August's warm glow of 293 hours. With a gradual increase observed from late spring through summer, September serves as a wonderful prelude to the sun-drenched October, which peaks at 308 hours. The consistent sunshine not only brightens the days but also sets the stage for vibrant outdoor activities amid the stunning backdrop of the Pacific.
As September rolls into Pago Pago, American Samoa, residents and visitors alike can look forward to a remarkably sunny month, with the likelihood of clear skies reaching an impressive 75%. This marks a significant upswing from the earlier months, where sunshine is less certain; for instance, January brings only a mere 31% chance of sun, while March and April see modest improvements at 26% and 42%, respectively. Following a gradual increase throughout the year, from a relatively cool 58% in May to 64% in July, September clearly stands out as a prime time for sun aficionados. As the year progresses into fall, this month not only offers warmer days but also embodies the essence of a tropical paradise bathed in sunlight, making it an ideal choice for those seeking enjoyment in the great outdoors.
In September, Pago Pago enjoys a return to longer days, with 12 hours of daylight that mark a transition from the shorter days of the mid-year months. Following a summer of consistent 11-hour days from April through August, the daylight duration increases again, mirroring the consistent lengths seen in January through March and from October to December. This cyclical pattern showcases the unique constancy of the island's daylight hours, where the comfort of 12-hour spans becomes a reliable feature as the year approaches its final quarter. The steady rhythm of daylight in Pago Pago not only enriches the natural beauty of the landscape but also invites residents and visitors alike to revel in the wonders of the island's sunny climate.
As September unfolds in Pago Pago, American Samoa, the winds reach an average speed of 6.0 m/s (13 mph), marking a noticeable mid-year shift. This gentle breeze follows a peak in July, when winds were at their strongest at 7.3 m/s (16 mph), and a slight decrease in August. Interestingly, September's winds remain robust compared to the calmer months of early spring, where speeds dipped as low as 3.9 m/s (9 mph) in April. The return to more favorable conditions hints at the natural rhythm of seasonal changes, with the winds typically remaining lively through the end of the year. The pattern suggests that as summer gives way to fall, the atmosphere in Pago Pago maintains a refreshing vitality, inviting both residents and visitors to embrace the allure of its coastal beauty.
Weather in Pago Pago varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Pago Pago, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather in Pago Pago tends to be warm and humid, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 28°C (83°F) and an average of 27°C (80°F). However, it also features considerable rainfall, accumulating 136 mm (5.4 in) over 21 days, leading to a high humidity level of 84%.
In contrast, January experiences slightly higher temperatures, with a minimum of 25°C (77°F) and a maximum of 29°C (85°F), while the average remains around 27°C (82°F). This month sees significantly more rainfall, totaling 301 mm (11.8 in) over 23 days, although the humidity is somewhat lower at 79%. For a detailed look at January weather, you can visit Pago Pago weather in January.
In comparing the weather of September and February, both months exhibit warm temperatures with averages hovering around 27°C (81°F). September has a minimum temperature of 25°C (77°F) and a maximum of 28°C (83°F), while February shows slightly higher maximums, reaching up to 30°C (86°F). However, February is significantly wetter, with a striking 464 mm (18.3 in) of precipitation over 25 days, in contrast to September's 136 mm (5.4 in) rainfall over 21 days. Humidity levels are somewhat comparable, with February at 80% and September at 84%. This detailed weather comparison highlights the marked difference in precipitation between the two months. For more specifics about February weather, refer to Pago Pago weather in February.
In comparing the weather of September and March, we observe some notable similarities and differences. Both months feature warm temperatures, with September showing a minimum of 25°C (77°F) and an average of 27°C (80°F), while March has a slightly higher maximum temperature reaching 29°C (85°F). Precipitation levels are higher in March, totaling 195 mm (7.7 in) over 25 days as opposed to September's 136 mm (5.4 in) across 21 days. Additionally, while September experiences slightly higher humidity at 84%, March maintains a comfortable 79%. For a more detailed look at March weather in the area, you can check Pago Pago weather in March.
When comparing the weather in September and April, both months exhibit warm temperatures, with September featuring a minimum of 25°C (77°F) and an average of 27°C (80°F), while April has similar minimum temperatures but slightly warmer maximums, reaching up to 29°C (85°F). However, April experiences significantly higher rainfall, with 228 mm (9.0 in) over 25 days compared to September's 136 mm (5.4 in) over 21 days. The humidity levels also differ slightly, with September at 84% and April at 79%. For a more detailed look at April’s weather conditions, check out Pago Pago weather in April.
When comparing the weather in September and May, both months exhibit warm temperatures, with minimums hovering around 25°C (77°F) and average highs reaching the upper 20s. However, May tends to be slightly warmer, with a maximum temperature of 29°C (85°F) compared to September's peak of 28°C (83°F). Notably, May also experiences more rainfall, accumulating 210 mm (8.3 in) over 25 days, while September sees less precipitation at 136 mm (5.4 in) across 21 days. Humidity levels are comparable, with September slightly higher at 84% compared to May’s 80%. For a detailed look at the weather specifics, check out Pago Pago weather in May.
In comparing the weather between September and June, we see some notable similarities and differences. Both months boast warm temperatures, with average highs around 27°C (81°F) in June and 28°C (83°F) in September. However, June experiences slightly cooler minimum temperatures, averaging 24°C (76°F), compared to September's 25°C (77°F). Precipitation is more pronounced in June, with 178 mm (7.0 in) spread over 23 days, contrasted with September’s 136 mm (5.4 in) over 21 days. Interestingly, both months have high humidity levels, though September is marginally more humid at 84% compared to June's 80%. For a detailed look at June weather specifically, you can check Pago Pago weather in June.
In comparing the weather between September and July, we see similar temperature ranges, with both months averaging around 27°C (80°F) and experiencing maximums of 28°C (83°F). However, September is slightly warmer on average, with minimum temperatures reaching 25°C (77°F), compared to July's 24°C (76°F). Rainfall is more prevalent in July, with 152 mm (6.0 in) of precipitation over 24 days, while September sees a little less at 136 mm (5.4 in) across 21 days. Additionally, September exhibits a higher humidity level at 84%, compared to July's 81%. For more detailed information about July weather, visit Pago Pago weather in July.
In comparing the weather between August and September, September sees slightly warmer temperatures with a minimum of 25°C (77°F) and an average of 27°C (80°F), while August has a minimum of 24°C (76°F) and an average of 26°C (80°F). Both months experience similar maximum temperatures, peaking at 28°C (83°F). Precipitation levels are slightly higher in September, with 136 mm (5.4 in) over 21 days compared to August's 128 mm (5.1 in) over 20 days. Humidity remains comparable, with September at 84% and August at 83%. For more detailed insights, you can check Pago Pago weather in August.
September and October share similar average temperatures, with both months hovering around 27°C (80°F). However, October tends to be slightly warmer, with a maximum temperature reaching 29°C (84°F) compared to September's 28°C (83°F). Precipitation is notably higher in October, accumulating to 225 mm (8.9 inches) over 23 days, whereas September experienced 136 mm (5.4 inches) over 21 days. Additionally, October's humidity remains slightly elevated at 85%, providing a sensación of mugginess that is characteristic of this transitional period. For more detailed insights on the weather, you can check Pago Pago weather in October.
September and November exhibit similar warm temperatures, with September having a minimum of 25°C (77°F) and a maximum of 28°C (83°F), while November shows slightly higher maximums at 29°C (84°F). The average temperature remains consistent at 27°C (81°F) in both months. However, November experiences significantly more precipitation, with 266 mm (10.5 in) over 24 days, compared to September's 136 mm (5.4 in) over 21 days. Humidity levels are also slightly lower in November at 82%, compared to 84% in September. For a more detailed look at November's weather, check out Pago Pago weather in November.
In September, the weather remains warm and humid, with average temperatures around 27°C (80°F) and relatively moderate precipitation of 136 mm (5.4 in) over 21 days. The humidity is quite high at 84%, contributing to a tropical feel. In contrast, December sees an increase in rainfall, with total precipitation rising significantly to 360 mm (14.2 in) spread across 29 days, despite similar average temperatures of 27°C (81°F). The slight decrease in humidity to 82% gives December a somewhat different atmosphere, making it feel a bit less oppressively humid than September. For a detailed comparison of December weather specifically in Pago Pago, you can check Pago Pago weather in December.
As September unfolds in Pago Pago, the tropical charm of the region is palpable, with temperatures remaining consistently warm, averaging around 27°C (80°F). While this month's warmth is typical for the area, it also brings increased humidity, averaging a notable 84%, which can make the heat feel more intense. Notably, September is marked by frequent rain, with 21 days of precipitation contributing to a total of 136 mm (5.4 in). This combination of warmth and moisture sets September apart from the drier months that precede it, creating a more lush and vibrant landscape. Visitors should prepare for the humid conditions and occasional showers, making the lush beauty of Pago Pago even more striking. For a detailed overview of what to expect year-round, visit Pago Pago Climate.